backfire

By Bshaips, Posted June 14, 2007

i have a 99 wr400 and i took off the valve cover to inspect the timing chain. it was all fine so i put it all back together and now it backfires when i totlay let off the gas. the only other thing i did was take the header pipe off and i was wondering if i didnt put it back right but i think thats kinda hard to do. Anyone know the problem?

By Pezman04wrx, Posted June 14, 2007

If it never backfired prior to the work you did I'd bet you've got an exhaust leak ... Re-check all your header connections and make sure they're seated well and tightened up (mainly the header/mid-pipe area) ...